head to head
Neither is simply harder - they are hard in different places. DOOM (2016) demands more optimization; SuperTuxKart demands more variance.

Execution · Pure Mechanics
Push-forward arena FPS where movement and aim are the whole game.

Execution · Pure Mechanics
Kart drift control and track knowledge with item luck shaking up placements.
DOOM (2016) leans Execution (Pure Mechanics); SuperTuxKart leans Execution (Pure Mechanics).
DOOM (2016) leans a little harder on execution, though the gap is small.
DOOM (2016)
Aim, movement, glory-kill timing all peak.
SuperTuxKart
Drift control and line holding decide races
SuperTuxKart leans a little harder on reads, though the gap is small.
DOOM (2016)
Demons scripted attack patterns.
SuperTuxKart
Human online races reward mild item mind-games
SuperTuxKart leans clearly harder on variance.
DOOM (2016)
Minimal encounter randomness.
SuperTuxKart
Item box rolls shake up placements
DOOM (2016) leans clearly harder on optimization.
DOOM (2016)
Rune and weapon mod picks meaningful.
SuperTuxKart
Track shortcuts and kart choice reward study
A matching score does not mean a matching test. Two games can both sit at 10 on execution and demand completely different things of you - which is why the reasoning above matters more than the number beside it.